Field-Induced Spin Nematic Liquid of the $S=1/2$ Bond-Alternating Chain with the Anisotropy

TL;DR

This paper investigates how an external magnetic field induces a spin nematic liquid phase in an anisotropic $S=1/2$ bond-alternating chain, revealing a phase diagram and the conditions for nematic dominance.

Contribution

It demonstrates the emergence of a nematic-spin-dominant Tomonaga-Luttinger liquid phase induced by magnetic field in an anisotropic bond-alternating chain, using numerical methods.

Findings

Nematic-spin-dominant phase appears under strong magnetic field and anisotropy.

Phase diagram maps the relationship between anisotropy, magnetization, and phase.

Numerical analysis confirms the field-induced nematic phase in the model.

Abstract

The $S=1/2$ ferromagnetic-antiferromagnetic bond-alternating spin chain with the anisotropy on the ferromagnetic exchange interaction in magnetic field is investigated using the numerical diagonalization and the density matrix renormalization group analyses. It is found that the nematic-spin-dominant Tomonaga-Luttinger liquid phase is induced by the external magnetic field for sufficiently large anisotropy. The phase diagram with respect to the anisotropy and the magnetization is presented.